Sand-molding machine.



No. 705,215. Patented July 22, I902.

J. B. DAVIES.

SAND MOLDING MACHINE.

(Application med Oct. 17. 1901.

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(Application filed Oct. 17. 1901.)

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UNITED L E FFI JOHN R. DAVIES, OF WAUKEGAN, ILLINOIS.

SAND-MOLDING MACHINE.

SPECIFICATION formingpart of Letters Patent No. 705,215, dated July 22, 1902.

Application filed October 17,1901. Serial No. 78,978. (No model To all whom it may concern:

Be it known that 1, JOHN R. DAVIES, acitizen of the United States, residing at ankegan ,in the county of Lake and State of Illinois, have invented a new and useful Improvement in Sand-Molding Machines, of which the fol lowing is a specification. I

The object of my invention is to provide a construction of sand-molding machine whereby all parts of the sand mold may be formed by compression simultaneously, with the advantages, besides the advantage of expedition, of securing uniformity of action upon the sand in packing it to form the mold and enabling the depressed parts to be compacted tighter than the raised portions. The desirability of providing for the tighter compacting of the depressed parts is well understood in the art of sand-molding, because in pouring the metal on the mold greater strain is exerted in the depressions than on the raised portions, owing to the greater weight of the amount of metal in the depressed portions, and, besides, it tends to prevent swelling of the metal and enables it to lie quietly on the raised parts.

My invention consists in the general construction of my improved sand-molding machine; and it also consists in details of construction and combinations of parts, all as hereinafter set forth.

Referring to the accompanying drawings, Figure 1 shows my improved sand-molding machine by a view in side elevation with the parts in the relative positions they occupy previous to operating the machine. Fig. 2 shows the same by a View in sectional elevation with the lower piston and the parts it carries raised, the section being taken at the line 2 on Fig. 3 and viewed in the direction of the arrow. Fig. 3 is asection taken at the line 3 on Fig. 2 and viewed in the direction of the arrow; Fig. a, a section taken at the line 4 on Fig. 3 viewed in the direction of the arrow and enlarged, and Fig. 5 an enlarged sectional view of a valve-controlled T-coupling detail.

A is the frame of the machine, which I prefer to form of three metal posts 0", r, and r arranged in triangular relation to each other and resting on casters g at their lower ends, the posts being sustained in their relative po sitions toward their lower ends by passing through the annular base-flange p of a cylinder B, fastened against collars 0 on the posts by nuts 0 thereon, and toward their upper ends by passing through the flange g of the head g on the upper end of the cylinder G, open at its lower end, the flange being fastened between nuts n and n on the upper end of each post except the post 1". Adjustable collars m and Z are also provided to afford stops at suitable points on each post. The cylinder B is shown open at its base and is provided with a head '2; at its upper end, and it affords a guide for a piston B, shown as a cylindrical jacket 1', telescopically surrounding the cylinder B and having a head e" and provided with outwardly-projecting ears m, extending about the posts as guides below the collars m.

D is the slot-plate, as it is commonly named, or silhouette-plate, as it is also termed, bifurcated at ears Z in its edge portion, suitably provided tobe guided by the posts where it engages them above the collars Z and provided with a depending annular flange portion h. I

On the'head 71' is removably fastened a pattern-plate E, carrying a pattern E, of which 7t is the core-print and represented in the present instance for the sake of simplicity as carrying an elbow-pattern to be projected through the slot-plate, as usual, in forming the sand mold, as hereinafter described, and on the slot-plate is seated a flask F.

The cylinder 0 contains a piston 0, shown as hollow and closed at both ends, with the rods 0 passing centrally through it in an upward direction and through a cap G on the head g, surmounted by a vertically-disposed cylinder G, through which the rod (3 extends at and carries near its upper end a piston C in the cylinder.

H is a supply-pipe for compressed air, lead ing from the source of air-pressure supply (not shown) through the cylinder B; by way of its base and through the cylinder-head U into the jacket 1' to direct the air-pressure against the piston B, and the pipe I-I contains a three-way cock f, which may be'of ordinary construction. Branches II and H lead, respectively, into a channel 2, opening into the base of the cylinder G and into a channel d,

formed in the cylinder-head g and opening into the upper end of the cylinder C from opposite ends of a T-coupling H with the pipe H. In this coupling H are seated two threeway cocks c and c, Fig. 5, of ordinary construction, each being adapted in one position to afford a discharge through the coupling into the open air from the particular branch H or H it controls and in its other position to open communication between said branch and the pipe H, and I connect the handles 0 and c by a link 0 and adjust them so that one opens to the outer air while the other is closed thereto, whereby turning their common operating-handle 0 forming an extension of the handle simultaneously opens one valve to the outer air and closes it to the pipe H and closes the other valve to the outer air and opens it to the pipe H.

I is an impression-plate carrying on its surface an impression of the pattern on the pattern-plate E, being, in fact, preferably formed therefrom and concave where the other is convex. The impression-plate pattern must always be arranged in such position with relation to the pattern on the plate E that its elevations and depressions coincide,respectively, with the depressions and elevations of the pattern on the lower plate, and for the purpose of causing the molding operation hereinafter described to compact the depressed portions in the sand mold tighter than the raised portions the impression-plate may be slightly deepened in its depressions.

For convenience in introducing the sand for the mold into the'flask F upon the pattern I provide a swinging box K, preferably of the form shown, having a sleeve 8 surrounding the post r and resting on an adjustable stop 8 thereon, the box having a grate-like open bottom I), against which there is slidingly supported a plate I), provided with a handle b and slotted like the bottom Z), whereby when the openings in the two coincide the sand in the box may drop through and whereby when the openings are out of coincidence the bottom of the box shall be closed.

To operate the machine, the cockfshould be first turned to admit air-pressure into the shell t' against the piston B and raise thelatter till stopped by the collars m, in which position the pattern IE will have protruded through the slot-plate D and the latter will have been raised as high as required to be met by the impression-plate I when lowered, as hereinafter described. The flask F is then adjusted and filled with sand by swinging the box K into'the position of hanging over it and pulling out the valve-plate b, after which the valve-plate is shoved back to close the bottom and the box is swung back into the position in which it is illustrated. Thereupon the valve 0 is turned to admit air-pressure through the channel 01 against the piston O to lower the latter till the impression-plate I meets the sand in the flask. The continued pressureagainst the piston O compacts the sand between the pattern and impression plates, forming the mold simultaneously throughout all parts by the action of the impression-plate, which may be regarded as a continuous or solid composite head in contradistinction to the separated heads or tamping-rods as it is common to provide in sandholding machines operated by air-pressure, with the advantages over the latter of attaining greater uniformity in the mold and enabling the casting made from the latter to be exactly like the pattern. When the sand mold has been formed, the handle 0 is manipulated to turn the valve 0 and admit airpressure into the uppermost cylinder G to raise the piston C therein, and thereby lift the piston O and impression-plate I, thus turning the handle 0 also opening the passage cZ through the valve 0' to the outer air for the egress of the air previously forced into the intermediate cylinder 0. Then the valve f is turned to permit the discharge from the shell 'i of the compressed air introduced through the lower cylinder 13 to raise the piston B", which descends by its own weight to remove the pattern from the sand.

For removing the flask F, containing the sand mold, I provide a swinging crane L, shown as a bracket a, supported to swing on and extend from the post r and terminating in a vertical socket a, through which extends a screw-rod a carrying a nut a at which it seats on the upper end of the socket, the nut being provided with a hand-wheel a and from the lower end of the screw-rod a there projects a fork a When the flask containing the finished mold is to be removed, the rod a is raised to the desired elevation by turning the hand-wheel a when the crane is turned on the post 1- to extend the fork a underneath arms or lugs a, projecting from the flask F. Then With the pins 0: removed by slightly raising the fork farther and turning the crane in the opposite direction the flask is carried off with it. Thereupon the machine is ready for another operation with the same pattern or to have a different pattern adjusted in place with its corresponding impression-plate previous to again operating the machine.

It will be noticed that the cylinder G and piston C are much smaller in diameter than the cylinder 0 and piston 0, since the pressure to be exerted against the piston O to raise the piston C may be much less than that required for compressing the latter against the sand.

What I claim as new, and desire to secure by Letters Patent, is

1. In a sand-molding machine, the combination with a frame-,of a lower cylinder provided with a piston, a pattern-plate supported on said piston, an intermediate cylinder provided with a piston, an impression-plate supported on said last-named piston and opposed to the pattern-plate, an uppermost cylinder,

a rod extending upward from said last-named piston and carrying at its upper end a piston movable in said uppermost cylinder, and fluid-pressure mechanism for actuating the pistons of the several cylinders, substantially as and for the purpose set forth.

2. A sand-molding machine comprising, in combination, a frame A formed of upright posts, a cylinder B supported on said frame and having a piston B, a pattern-plate E supported on said piston, a slot-plate D movably supported on the frame above said piston, a flask F carried by said piston, a cylinder C supported on said frame and having a piston 0 provided with a rod G a cylinder :l containing a piston C on the upper end of said rod, and a fluid-pressure-supply pipe ll for directing fluid-pressure against the several said pistons and provided with valves for controlling the direction of said pressure, sulo stantially as and for the purpose set forth.

A sand-molding machine comprising, in

combination with a frame, a lower cylinder B provided with a piston B, a pattern-plate E supported on said piston, an intermediate cylinder 0, containing a piston C, an uppermost cylinder G containing a piston C an impression-plate I on said piston G opposed to the pattern-plate, a rod 0 connecting said pistons U and C channels (1 and e leading, respectively,into the upper end of the cylinder 0 and into the lower end of the cylinder Gr, a fluid-pressure-supply pipe H containing a three-way valve f and leading through the lower cylinder to said piston, a coupling H through which the said pipe is connected with said channels, and oppositely-arranged three- Way valves 0 and c in said coupling, the Whole being; constructed and arranged to operate substantially as and for the purpose set forth.

JOHN R. DAVIES. ln presence ot'- ALBERT D. BACCI, WM. 15. Dawns. 

